The element antimony has an atomic weight of 121.757 amu and only two naturally occurring isotopes. One isotope has an abundance of 57.3% and an isotopic mass of 120.904 amu. What is the mass of the other isotope?
A) 52.479 amu
B) 121.757 amu
C) 122.393 amu
D) 122.610 amu
E) 122.902 amu
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